Hi doctor, I am 35 year old male recently I had whitehead pimples between my scrotum and rectum I am on cephalexin and it still there. Any help?

Go see your doctor. Continue to take your Cephalexin antibiotic as directed. Then keep follow up appointment that's been arranged w/prescribing physician. Of course, if no follow up appointment was made, then make one now. Or ask to be seen tomorrow if symptoms worsen (in other words, don't wait).